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Title: Bright Infrared‐to‐Ultraviolet/Visible Upconversion in Small Alkaline Earth‐Based Nanoparticles with Biocompatible CaF 2 Shells

Abstract

Abstract Upconverting nanoparticles (UCNPs) are promising candidates for photon‐driven reactions, including light‐triggered drug delivery, photodynamic therapy, and photocatalysis. Herein, we investigate the NIR‐to‐UV/visible emission of sub‐15 nm alkaline‐earth rare‐earth fluoride UCNPs (M 1− x Ln x F 2+ x , MLnF) with a CaF 2 shell. We synthesize 8 alkaline‐earth host materials doped with Yb 3+ and Tm 3+ , with alkaline‐earth (M) spanning Ca, Sr, and Ba, MgSr, CaSr, CaBa, SrBa, and CaSrBa. We explore UCNP composition, size, and lanthanide doping‐dependent emission, focusing on upconversion quantum yield (UCQY) and UV emission. UCQY values of 2.46 % at 250 W cm −2 are achieved with 14.5 nm SrLuF@CaF 2 particles, with 7.3 % of total emission in the UV. In 10.9 nm SrYbF:1 %Tm 3+ @CaF 2 particles, UV emission increased to 9.9 % with UCQY at 1.14 %. We demonstrate dye degradation under NIR illumination using SrYbF:1 %Tm 3+ @CaF 2 , highlighting the efficiency of these UCNPs and their ability to trigger photoprocesses.

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [2]; ORCiD logo [1]
  1. Department of Materials Science and Engineering Stanford University 496 Lomita Mall Stanford CA 94305 USA
  2. Materials Science Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA, Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA, Department of Materials Science and Engineering University of California, Berkeley Berkeley CA 94720 USA, Kavli Energy Nanoscience Institute Berkeley CA 94720 USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1786193
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Angewandte Chemie (International Edition)
Additional Journal Information:
Journal Name: Angewandte Chemie (International Edition) Journal Volume: 59 Journal Issue: 48; Journal ID: ISSN 1433-7851
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Fischer, Stefan, Siefe, Chris, Swearer, Dayne F., McLellan, Claire A., Alivisatos, A. Paul, and Dionne, Jennifer A. Bright Infrared‐to‐Ultraviolet/Visible Upconversion in Small Alkaline Earth‐Based Nanoparticles with Biocompatible CaF 2 Shells. Germany: N. p., 2020. Web. doi:10.1002/anie.202007683.
Fischer, Stefan, Siefe, Chris, Swearer, Dayne F., McLellan, Claire A., Alivisatos, A. Paul, & Dionne, Jennifer A. Bright Infrared‐to‐Ultraviolet/Visible Upconversion in Small Alkaline Earth‐Based Nanoparticles with Biocompatible CaF 2 Shells. Germany. https://doi.org/10.1002/anie.202007683
Fischer, Stefan, Siefe, Chris, Swearer, Dayne F., McLellan, Claire A., Alivisatos, A. Paul, and Dionne, Jennifer A. Wed . "Bright Infrared‐to‐Ultraviolet/Visible Upconversion in Small Alkaline Earth‐Based Nanoparticles with Biocompatible CaF 2 Shells". Germany. https://doi.org/10.1002/anie.202007683.
@article{osti_1786193,
title = {Bright Infrared‐to‐Ultraviolet/Visible Upconversion in Small Alkaline Earth‐Based Nanoparticles with Biocompatible CaF 2 Shells},
author = {Fischer, Stefan and Siefe, Chris and Swearer, Dayne F. and McLellan, Claire A. and Alivisatos, A. Paul and Dionne, Jennifer A.},
abstractNote = {Abstract Upconverting nanoparticles (UCNPs) are promising candidates for photon‐driven reactions, including light‐triggered drug delivery, photodynamic therapy, and photocatalysis. Herein, we investigate the NIR‐to‐UV/visible emission of sub‐15 nm alkaline‐earth rare‐earth fluoride UCNPs (M 1− x Ln x F 2+ x , MLnF) with a CaF 2 shell. We synthesize 8 alkaline‐earth host materials doped with Yb 3+ and Tm 3+ , with alkaline‐earth (M) spanning Ca, Sr, and Ba, MgSr, CaSr, CaBa, SrBa, and CaSrBa. We explore UCNP composition, size, and lanthanide doping‐dependent emission, focusing on upconversion quantum yield (UCQY) and UV emission. UCQY values of 2.46 % at 250 W cm −2 are achieved with 14.5 nm SrLuF@CaF 2 particles, with 7.3 % of total emission in the UV. In 10.9 nm SrYbF:1 %Tm 3+ @CaF 2 particles, UV emission increased to 9.9 % with UCQY at 1.14 %. We demonstrate dye degradation under NIR illumination using SrYbF:1 %Tm 3+ @CaF 2 , highlighting the efficiency of these UCNPs and their ability to trigger photoprocesses.},
doi = {10.1002/anie.202007683},
journal = {Angewandte Chemie (International Edition)},
number = 48,
volume = 59,
place = {Germany},
year = {Wed Sep 23 00:00:00 EDT 2020},
month = {Wed Sep 23 00:00:00 EDT 2020}
}

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